Gamblin Galkyd Fast Dry Medium - Gamblin Galkyd is an alkyd resin painting medium that increases the fluidity of oil colors and speeds their drying time. Thin layers of oil colors are dry in 24 hours. The viscosity of Galkyd is similar to traditional painting mediums made from linseed stand oil. Galkyd levels brush strokes, creates a strong flexible paint film and leaves an enamel like glossy finish. Galkyd is ready to use. Thins with odorless mineral spirits. Painters can add up to 50% by volume odorless mineral spirits to change the viscosity of Galkyd for glazing. Galkyds are excellent glazing mediums.